It's about one-seven-thousand-five-hundredth as tall as The Challenger Deep (Marianas Trench).

In other words, 56.40 inches is 0.0001314 times the height of The Challenger Deep (Marianas Trench), and the height of The Challenger Deep (Marianas Trench) is 7,610.40 times that amount.

(near Marianas Islands, a.k.a. Ladrones Islands, northwestern Pacific Ocean) (depth below sea level)The Challenger Deep, at the southern end of the Marianas Trench, reaches a depth of 429,210 inches below sea level. There has been only one manned expedition to the bottom of Challenger Deep — a 1960 voyage that took 4 hours and 48 minutes to reach the bottom.

It's about one-seven-thousand-five-hundredth as tall as Maxwell Montes.

In other words, the height of Maxwell Montes is 7,700 times 56.40 inches.

(Ishtar Terra, Venus)Maxwell Montes rises to a total height of 430,000 inches. Since Venus does not seem to have the kind of tectonic activity which gives rise to mountains on Earth, the origin of the Venusian mountain remains the subject of some dispute.

In other words, the height of Olympus Mons is 19,000 times 56.40 inches.

(a.k.a. Mount Olympus) (Mars)The tallest mountain in the solar system, Olympus Mons rises to approximately 1,100,000 inches. The mountain has been known to astronomers since the nineteenth century because it is tall enough to rise above Mars' frequent dust storms.

In other words, the length of The Panama Canal is 63,000 times 56.40 inches.

(Canal de Panamá) (Panama)
Connecting the Atlantic and Pacific Oceans across the Isthmus of Panama, the Canal measures 3,500,000 inches in length. Ships passing through the Canal are raised (and then lowered) 1,000 inches above sea level through the lock-and-dam system.